One interesting and surprising finding regarding the regulation of the ara operon is that it is under both positive and negative control. what protein is responsible for the dual action of this operon? one interesting and surprising finding regarding the regulation of the ara operon is that it is under both positive and negative control. what protein is responsible for the dual action of this operon? arac is responsible for both the positive and negative control of the ara operon. rna polymerasse is responsible for both the positive and negative control of the ara operon. arabad is responsible for both the positive and negative control of the ara operon. dna polymerase is responsible for both the positive and negative control of the ara operon. arad is responsible for both the positive and negative control of the ara operon.